CP Pistons Mitsubishi forged piston and ring set 4B11 / EVO X pistons 3.543 90mm +4mm oversize bore; 9.0 compression 1.313 ch light weight high strength forged piston set for use in high performance and racing engines. Set includes pistons; light weight wrist pins; lock rings and high performance piston rings. Will work with stock or oversize valves and stock or high lift camshafts. Highest quality and engineered for durability and maximum power output. Pistons are fully CNC machined; balanced to + / - 1 gram. Double pin oilers as well as pin lock removal grooves for easy lock removal are also included as is pin fitting. Part number CP SC7223; OK for turbo or supercharger; nitrous